January 2 - The lowest temperature recorded in Ireland in the 20th century, -18.8C (-1.8F) at Lullymore, Co. Kildare. See 1881 for the lowest on record [1].
January 8 - Fifty are killed when an explosion destroys the French oil tanker Betelgeuse off Whiddy Island.
The IRA blow up 18 British soldiers with 2 bombs in the Warrenpoint ambush.
September 29 - Pope John Paul II arrives in Ireland for a three day visit. 1.25 million people, just over one-quarter of the population, welcome him at a special mass in the Phoenix Park. Later in the day His Holiness speaks to 200,000 people at Drogheda, County Louth. The Pope returns to Dublin in the evening where an estimated 750,000 people witness his motorcade travel through the city.
September 30 - Pope John Paul II addresses 285,000 people at a youth rally in Galway, before travelling to Knock, County Mayo where a further 300,000 people hear him speak. visits Clonmacnoise and Galway.
December 5 - Jack Lynch announces his resignation as Taoiseach and leader of Fianna Fáil. He has led the party for 13 years spending 9 years as Taoiseach.
December 31 - 1979 is the worst year ever for industrial disputes in Ireland. Industrial disputes cost the economy over 1,460,000 working days this year.
Arts and literature
Thomas Flanagan's novel The Year of the French is published.
Sport
Athletics
John Treacy wins the world cross-country championship for the second time .